The Red River Hog is widely, but patchily, distributed through the West and Central African rainforest belt, from Senegal in the west, throughout the Guinea-Congo forest to at least west of the Albertine Rift. Further east and south-east, replaced by the Bushpig, although the precise borders between the ranges of the two species remain unclear. There are no confirmed records from Sudan or Chad, though they may occur in extreme south-western Sudan (Leus and Vercammen in press). There are also as yet no reliable records from The Gambia, which is just outside their natural range (Grubb et al. 1998). There is no confirmation of their presence on Bioko Island.